Answer:
(The sum) is the combined flow of return flow and DPS.
B is the best answer.
I hope this helps! :)
The Gobi Desert spans across Mongolia and China. It specifically runs across northwestern and northern China and Southern Mongolia. The Gobi is a large desert region in Asia and is a rain shadow desert formed by the Himalaya range blocking rain-carrying clouds from the Indian Ocean from reaching the Gobi territory. The Gobi is most notable for it being the location for several important cities in the Silk Road and as part of the Great Mongol Empire.
Erosion,oil spills,pollution,tourism,urban development
